Chevrolet 1996 Astro Owner's Manual Page 118

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Malfunction Indicator
Lamp
(Service Engine Soon Light)
SERVICE
ENGINE
SOON
Your vehicle is equipped
with a computer which
monitors operation of the
fuel, ignition and emission
control systems.
This system
is
called OBD
I1
(On-Board
Diagnostics-Second Generation) and is intended to
assure that emissions are at acceptable levels for the
life of the vehicle, helping to produce a cleaner
environment. (In Canada,
OBD
I1
is replaced by
Enhanced Diagnostics.) The SERVICE ENGINE SOON
light comes on to indicate that there is a problem and
service is required. Malfunctions often will be indicated
by the system before any problem is apparent, which
may prevent more serious damage to your vehicle. This
system is also designed to assist your service technician
in correctly diagnosing any malfunction.
NOTICE:
If you keep driving your vehicle with this light
on, after a while, your emission controls may not
work as well, your fuel economy may not be as
good and your engine may not run as smoothly.
This could lead to costly repairs that may not be
covered by your warranty.
This light should come on, as a check to show
you
it is
working, when the ignition is
on
and the engine
is
not
running. If the light doesn’t come on, have it repaired.
This light will also come
on
during a malfunction in one
of two ways:
Light Flashing
--
A
misfire condition has been
detected.
A
misfire increases vehicle emissions and
may damage the emission control system
on
your
vehicle. Dealer or qualified service center diagnosis
and service is required.
0
Light On Steady
--
An emission control system
malfunction has been detected on your vehicle.
Dealer or qualified service center diagnosis and
service may be required.
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